NOTE: Country rankings of the type presented above cannot pretend to be
definitive; instead they aspire only to provide the reader with an
approximation of the high and low ends on a particular scale. Country data
vary enormously depending on the sources, and the absence of reliable data
on some countries requires their omission, which further skews the
results. sOnly countries for which statistics were available figure in these lits. Sources: The World Factbook, 2015.